Centrifugal pump.



No. 807,971. PATENTED DEC. 19, 1905. G. W. SKINNER, JR.

OENTRIFUGAL PUMP.

APPLICATION FILED APR.19, 1905.

3 SHEETS--SHEET 1.

No. 807,971. PATENTED DEC. 19, 1906.

G. W. SKINNER, JR.

GENTRIFUGAL PUMP.

APPLICATION FILED APR.19. 1905.

3 SHEETSSHEET 2.

i ma/aces @zz djf%% i ""2 P 2% gm WW without injury to the mechanism.

GEORGE W. SKIN N ER, J R.,

OF DENVER, COLORADO.

CENTRIFUGAL PUMP.

Specification of Letters Patent.

Patented Dec. 19, 1905.

Application filed April 19, 1905. Serial No. 256.503.

To all whmn it may concern.-

Be it known that I, GEORGE W. SKINNER, Jr., a citizen of the UnitedStates, residing in the city and county of Denver and State of Colorado,have invented certain new and use ful Improvements in Centrifugal Pumps;and I do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to the letters and figures ofreference marked thereon, which form a part of this specification.

My invention relates to improvements in centrifugal pumps moreespecially intended for handling sand, slime, and gravel in thetreatment of placer material, though of course it may be employed inhandling material of the character stated regardless of the object orpurpose of so handling it. Pumps of this character are employed inconnection with the construction set forth in my application forplacer-mining apparatus, Serial No. 254,865, filed April 10, 1905. In apump for this purpose it is particularly desirable that provision shallbe made for protecting the bearings from the sand, grit, and dirt whichunder ordinary circumstances are sure to come in contact therewithduring the treatment of material of this character. Pumps employed forthis purpose must of necessity be provided with a detachable liningadapted to be removed when worn in order that new linings may besuccessively substituted. The material under treatment works in betweenthe lining and the body of the pump and thence finds its way into thebearings, and if no provision is made for its removal these bearingswill soon wear out or become destroyed and greatly increase the cost ofmaintaining the apparatus.

In my improved construction I have formed a water-space around thebearing of the shaft connected with a rotary piston. I have also madeprovision for supplying this space or chamber with water and for drawingthe water therefrom. This water inlet and discharge may be constantlymaintained, whereby any dirt that otherwise might come in contact withthe bearing with injurious results will be washed out and carried away Ihave also made provision for leaving a slight wator-space between thelining and the body of the casing. This space is also supplied withwater, and provision is further made for the escape of the watertherefrom, thus having a tendency to keep the pump clean from dirt andsand. This feature prevents to a large extent the entrance of dirt tothe bearings, since there is little opportunity for the dirt to get tothe hearing or bearings except by way of the space between the liningand the body of the pump-casing. Provision is also made for mounting twopumps upon the same operating-shaft, with the inlet and discharge of onepump extending in different directions, respectively, from the inlet anddischarge of the other pump,whereby the strains to which the pumps aresubjected by reason of the coarse material handled by them areneutralized or overcome to a certain extent, since by reason of theaforesaid arrangement these strains or forces are made to work againsteach other.

Having briefly outlined my improved construction, as well as thefunction it is intended to perform, I will proceed to describe the samein detail, reference being made to the accompanying drawings, in whichis illustrated an embodiment thereof.

In the drawings, Figure 1 is a vertical section taken through acentrifugal pump equipped with my improvements. This section is taken onthe linel 1, Fig. 2. Fig. 2 is a section taken at right angles to Fig.1, being a section taken on the line 2 2 of the lastnamed figure. Fig. 3is an enlarged fragmentary sectional view of a portion of the right-handside to Fig. 1. Fig. 4 is a detail view, partly in section, illustratingthe ballbearing construction with the operatingshaft. Fig. 5 is a viewillustrating two pumps mounted on the same operating-shaft and arrangedwith their respective inlets and discharges extending in differentdirections.

The same reference characters indicate the same parts in all the .views.

Let the numeral 5 designate the pump-cas ing, the same being composed oftwo members provided with exteriorlyprojecting meeting flanges 6,connected by bolts 7. This casing at one extremity is provided with astuffing-box 8, the same being connected with the casing in such amanner as to form a water-chamber surrounding the inner extremity of theoperatingshaft 10, where it is connected with the rotary pumppiston 12by means of a key 3. This chamber 9 is located just inside thestuffing-box bearing for the said shaft. The stu'l'fing-box may be ofany rection indicated by the arrows in Fig. 2.

The casing 5 is provided with a circular lining 17 and wearing-plates 18and 19, located on opposite sides and cooperating with the lining toprotect the casing or body portion of the pump. The lining and thesewearingplates are removable when worn and new corresponding elementssubstituted therefor as often as may seem necessary or desirable.Provision is made for allowing a slight space 20 between the casing andthe lining and the wearing-plates for the circulation of water, thewater being introduced through a conduit 21 and taken out through aconduit 22. In this way the water is introduced to the space 20 andtaken out therefrom on opposite sides of a ballbearing construction 23,surrounding the inlet-conduit 14, through which the material to betreated passes to the pump. The space 20 between the casing and iningsthereof is maintained by means of set bolts 24, which are threaded inthe body of the casing or parts directly connected there with and bearagainst wearing-plates 18 and 1.9. These wearing-plates and the liningare providedwith oppositely-beveled edges where they join. a

The water-chamber 9 is closed on the inside or on the side opposite thestuffing-box 8 by means of a comparatively thin washer 25, connectedwith the wearing-plate 18 by means of taper bolts 26, which pass throughpacking-washers 27 and 28, preferably composed of leather and interposedbetween the washer 25 and the wearing-plate 18. On the inside of thewasher 25 is a rubber gasket 29, connected with the washer by screws 30.Inside of this washer 29 is a metal ring 31,connected with the body ofthe rotary piston by screws 32. The rubber gasket 29 closely engages thehub 33 of the rotary piston. This hub is recessed to receive theoperating-shaft 10. The close fit of the rubber gasket around this hubhas a tendency to prevent the material under treatment from gainingaccess to the bearing of the operating-shaft and to keep the dirt out ofthe chamber 9. The leather washers 27 and 28 have a further tendency toprevent the dirt or material under treatment from entering thewater-chamber 9.

It will be known from the drawings and from the general information withreference to pumps of this character that the rotary piston 12 is openand that this opening registers with the inlet-conduit 14:, throughwhich the material to be treated passes. posite side of the piston, orthat directly in front of the inlet-opening 34, is reinforced, as shownat 35, and tapers gradually therefrom to its outer periphery. The innersurface of this reinforced portion is provided with spiral ribs 36,whose tendency is to cause the material to readily move outwardly fromthe center of the piston as it strikes thereagainst as it is fed intothe machine, thus as far as possible relieving the apparatus from theend thrust incident to the entrance of the coarse material of the classwhich the apparatus is designed to handle. The vibration incident to thestriking of the material against the reinforced side of the piston isrelieved through the instrumentality of the flexible washer 29 and theother construction in close relationship therewith, as heretoforedescribed.

From the foregoing description the use and operation of my improvedcentrifugal pump will be readily understood. By reference to Fig. 5 themanner of mounting two pumps on the same operating-shaft 10 will bereadily understood. These pumps are both of the centrifugal type, butnot exactly the same in external appearance. However, they may beconsidered the same for all practical purposes. The pump on the left ofthe View is precisely of the same construction shown in Figs. 1 and 2 ofthe drawings. The pump on the right, which I will designate as 5, isslightly different in external construction; but its interior mechanismmay be considered substantially the same. The inlet-conduits of thesepumps outside of the casing 50 may be designated A and B, respectively,while their discharge conduits or outlets may be designated 16 and D,respectively. The power is transmitted to the shaft 10 through theinstrumentality of a belt E or other suitable instrumentality foroperating both pumps. As the inlet and discharge of one pump extend indifferent directions, respec tively, from the inlet and discharge of theother pump, it will be understood that the strains to which the pumpswould ordinarily be subjected during their operation will to a certainextent be neutralized and overcome, as heretofore explained.

By reference to Figs. 1 and 2 of the drawings it will be understood thatas the material enters the pump by way of the conduit 14 through thepiston-0pening 34 this material under the influence of the rotary actionof the piston will be thrown outwardly into the chamber 15, through thepiston-openings 13, and thence carried through the outlet 16.

The piston discharges or mouths 13 are each provided on one side with awearing shoe 37, the same being detachably connected with the body ofthe piston by bolts 38, inserted from the outside through pockets 39,formed in the members 410 of the rotary piston. These wearing-shoes aresubjected to The opmost of the wear on the piston and are readilydetachable when they become worn. By reason of this feature the body ofthe piston may be used indefinitely by simply removing thesewearing-shoes and substituting others at suitable intervals. At theangle 41 of the pump-chamber adjacent the discharge-mouth 16 is locateda detachable wearing-plate 42 of angular shape and preferably made ofhardened metal or other suitable material having great wearing capacity.It is at this angle of the chamber where the shell or casing issubjected to the greatest wear, since the material, or at least aportion of it, is thrown against the angle-shoe 42 with great force.This angle-plate is held in place by a bolt 43, passed transverselythrough the casing.

As shown in Fig. 4, the operating-shaft 10 is mounted on pedestals 44,provided with ball bearings, each consisting of a spoolshaped centralmember 45, having recesses in its opposite ends to receive thebearingballs 46. On each side of this spool and threaded on the shaft 10is placed a nut 47, forming the other member of the ball-bearing, thesaid nut being recessed to receive the bearing-balls and held in placeby a lock-nut 48. These ball-bearings are adapted to resist the endthrust on the shaft incident to the discharge of the material againstthe reinforced part of the rotary piston of the ump.

Having thus described my invention, what I claim is the body of thepump-casing, inlet and outlet means for introducing liquid to andremoving it from the space, a rotary piston mounted in the casing andprovided with a water-containing chamber adjacent the piston-bearing,and means for introducing liquid to and removing it from said chamber.

3. A centrifugal pump provided withacasing having a removable lining, ashallow space being maintained between the lining and the casing, meansfor introducing water a rotary piston mounted in the casing and havingdetachable wearing-shoes forming one wall of the outlets from the pistonto the body of the pump.

movable lining, a shallow space being main tained between the lining andthe casing, and means for introducing water to this space and removingit therefrom at will, the casing being provided with a detachableangle-shaped wearing-plate located adjacent its outletopening andextending inwardly therefrom for the purpose set forth.

5. In apparatus of the class described, the combination of a number ofcentrifugal pumps, a common operating shaft upon which the pump-pistonsare mounted, one pump being provided with inlet and discharge conduitsprojecting respectively, in different directions from the inlet anddischarge conduits of another pump for the purpose set forth.

In testimony whereof I aflfix my signature in presence of two witnesses.

Witnesses:

DENA NELSON, A. J. OBRIEN.

to this space and removing it therefrom, and v 4. A centrifugal pumpprovided with a re-

